#include<iostream>
#include<iomanip>
using namespace std;

int main()
{
	double a = 2;
	double b = 1;
	double n = 20;
	double all=0;

	while (n)
	{
		n--;
		all = all + a / b;
		cout << "number:" << all << endl;
		a = a + b;
		b = a - b;

	}
	

	int key;
	cin >> key;

	return 0;

}